What is Aluminum Boride?

What is it?

Aluminum Boride

Aluminum boride, a binary compound that is made of aluminum and Boron, is known as AlB2. AlB2 is its chemical formula. It is a reddish solid at normal temperatures and pressures. It loses its luster as it heats. It is stable when it is heated in cold dilute acid. However, it will break down in hot hydrochloric or nitric acid. It can be obtained by heating fine powders made of aluminum and/or boron, and then reacting with them.

Aluminum Boride: The Characteristics

Aluminum Boride is a monoclinic, black, glossy, monoclinic crystal that has a specific weight of 2.55 (18degC). It’s insoluble in water and acid, but can be decomposed using hot nitric acids. The aluminum boride was made by melting aluminum, sulfur, and boron trioxide together. Aluminum Boride is a dangerous substance as it reacts with acid or hydrogen to make toxic gases. Aluminum boride reacts with hydrochloric to release borane or aluminum chloride. Structurally, the B atoms form graphite sheets with Al between them. This is very similar in structure to magnesium diboride. AlB2 is a single crystal that exhibits metallic conductivity with an axis parallel the hexagonal plane.

Aluminum Diboride AlB2 Powder Properties

Other Titles
aluminium boride, aluminum diboride, AIB2


Combination Formula

Molecular Weight
48.604 g/mol

Copper-red solid

Melting Point
>920 degC (decomposes)

Solubility of in water

3.19 g/cm3


Particle size

Poisson’s Ratio

Specific heat

Thermal Conductivity

Thermal Expansion

Young’s Modulus



Aluminum Diboride AlB2 Powder CAS 12041-50-8

How to prepare aluminum iboride

AlB12 powder was created by powder metalurgist using amorphous Born powder and aluminum powder. To determine the product’s phase composition and relative content, the Xray diffractometer was used and the scanning electron microscope was used. The product’s impurities are determined by the amount of buried powder Al. The buried powder Al content is 30% (mass content, the same below), and elemental Al exists in the product; the buried powder Al content is 10%, and the impurities are mainly Al2O3; When the Al content of the buried powder is 20%, the impurity content is the least, which is mainly oxy-magnesium-aluminum phase. The best process parameters for synthesis include constant temperature of 1400 and 60 minutes, an Al content of 17.2%, as well as 20% Al content in the buried powder.

Aluminum Boride: What are its applications?

The structure of aluminum Boride is similar to those of intermetallic compound. Its structure depends mainly on the crystal structure aluminum metal and boron, rather than their valence relation. AlB2, AlB4 or AlB12 are all aluminum borides. AlB2 can also be created by reacting two elements greater than 600. It is a layered structure. Al and B atoms are directly overlain (A, A modes), and B atoms can be filled in the triangular column that forms from the direct overlap of Al. That is, the boron layers are between the aluminum layers. The structure and function of the boron layer are similar to that found in graphite. The hexagonal network of boron molecules is created by their interconnections. The distance between each boron atom and the other B atoms in the hexagonal network is 0.173 nm. There are six Al-atoms that connect to the B. These occupy the vertices the triangular prism greater. Dilute hydrochloric Acid can dissolve AlB2 to make a reducing mixture, which may include HB(OH),+. AlB2 is not soluble in dilute sulfuric acids, but it is soluble in nitric. AlB2 will eventually decompose to AlB12 if it reaches 920°C.

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